CN114305404A - Radiant heat collecting and amplifying circuit and application thereof - Google Patents
Radiant heat collecting and amplifying circuit and application thereof Download PDFInfo
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- CN114305404A CN114305404A CN202111632141.1A CN202111632141A CN114305404A CN 114305404 A CN114305404 A CN 114305404A CN 202111632141 A CN202111632141 A CN 202111632141A CN 114305404 A CN114305404 A CN 114305404A
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- 230000003321 amplification Effects 0.000 claims abstract description 36
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 36
- 230000005855 radiation Effects 0.000 claims abstract description 24
- 230000008859 change Effects 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 230000004044 response Effects 0.000 claims description 12
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 10
- 239000008103 glucose Substances 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 9
- 239000008280 blood Substances 0.000 claims description 5
- 210000004369 blood Anatomy 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 238000005070 sampling Methods 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000036760 body temperature Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000001061 forehead Anatomy 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention relates to a radiant heat collecting and amplifying circuit and application thereof, wherein the radiant heat collecting and amplifying circuit comprises: the device comprises an acquisition circuit, a primary amplification circuit, a rectification filter circuit and a secondary amplification circuit; the acquisition circuit receives an infrared radiation signal of a measured object, converts the infrared radiation signal into a radiant heat acquisition voltage signal and outputs the radiant heat acquisition voltage signal; the primary amplifying circuit amplifies the radiant heat collecting voltage signal and outputs a primary amplified voltage signal; and the voltage signal after primary amplification is rectified and filtered by a rectifying and filtering circuit, and then secondarily amplified by a secondary amplifying circuit, and a radiant heat collection amplification output voltage signal is output. The radiant heat collecting and amplifying circuit can convert small temperature change into higher voltage output quantity, and has high signal collecting precision, low noise and high signal-to-noise ratio, thereby having higher sampling accuracy and sensitivity.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a radiant heat collecting and amplifying circuit and application thereof.
Background
Thermal radiation refers to the phenomenon of an object radiating electromagnetic waves due to having a temperature, all temperatures being above absolute zero. All objects with the temperature higher than the absolute zero degree can generate heat radiation, and the higher the temperature is, the greater the total energy radiated is, and the more the short-wave components are. The spectrum of the thermal radiation is a continuous spectrum, the wavelength coverage can theoretically be from 0 to ∞, and the general thermal radiation is mainly transmitted by visible light and infrared rays having a long wavelength.
The radiation heat collection based on the principle is widely used for detecting the body temperature of an organism. Like a forehead thermometer and an ear thermometer, the detection is realized by utilizing the principle.
Although the body temperature measurement precision of the method can reach 0.1 ℃, the application range is limited, and the existing radiant heat collecting circuit is not completely applicable to the test requirements of higher precision and high signal to noise ratio.
In the noninvasive blood glucose meter device, a temperature acquisition device for detecting the body surface temperature of a measured object is also loaded, but in the prior art, the common practice is to sense the temperature of the skin of the measured object through a temperature sensor, obtain temperature data and utilize the data to improve the accuracy of blood glucose detection data.
However, the voltage signal corresponding to the temperature obtained by the method is weak, the resolution precision is not high, and the result of the blood glucose test is inaccurate.
Disclosure of Invention
The embodiment of the invention provides a radiant heat collecting and amplifying circuit and application thereof. The radiant heat collecting and amplifying circuit can convert small temperature change into high voltage output quantity, and has high sampling accuracy and sensitivity.
In a first aspect, an embodiment of the present invention provides a radiant heat collecting and amplifying circuit, where the radiant heat collecting and amplifying circuit includes: the device comprises an acquisition circuit, a primary amplification circuit, a rectification filter circuit and a secondary amplification circuit;
the acquisition circuit receives an infrared radiation signal of a measured object, converts the infrared radiation signal into a radiant heat acquisition voltage signal and outputs the radiant heat acquisition voltage signal;
the primary amplifying circuit amplifies the radiant heat collecting voltage signal and outputs a primary amplified voltage signal;
and the voltage signal after primary amplification is rectified and filtered by a rectifying and filtering circuit, and then secondarily amplified by a secondary amplifying circuit, and a radiant heat collection amplification output voltage signal is output.
Preferably, the acquisition circuit comprises: the voltage stabilizing filter input circuit and the acquisition sensor;
the voltage-stabilizing filter input circuit is used for providing reference working voltage for the acquisition sensor;
the acquisition sensor detects an infrared radiation signal of a detected object under the reference working voltage to generate a response voltage; the response voltage changes along with the temperature change of the measured object;
a thermistor arranged in the acquisition sensor detects the ambient temperature to obtain ambient temperature data;
and correcting the response voltage according to the environment temperature data to obtain the radiant heat collection voltage signal.
Preferably, the primary amplification circuit includes: an instrumentation amplifier and a gain adjustment resistor;
the gain adjusting resistor is connected between two gain setting pins of the instrumentation amplifier, and the amplification factor of the instrumentation amplifier is adjusted by adjusting the resistance value of the gain adjusting resistor.
Preferably, the two-stage amplifying circuit includes: an amplifier and a feedback circuit;
the feedback circuit is connected from the output of the amplifier to the reference signal input of the amplifier.
Preferably, the second-stage amplifying circuit further includes a decoupling capacitor, one end of the decoupling capacitor is connected to the working voltage input of the amplifier, and the other end of the decoupling capacitor is grounded.
Preferably, the radiant heat collecting and amplifying circuit amplifies the radiant heat collecting voltage signal of the μ V or mV level to the radiant heat collecting and amplifying output voltage signal of the V level.
In a second aspect, an embodiment of the present invention provides a use of the bolometric amplification circuit described in the first aspect, where the bolometric amplification circuit is used in a signal acquisition circuit of a noninvasive glucometer.
In a third aspect, an embodiment of the present invention provides an noninvasive glucose meter, including the radiant heat collecting and amplifying circuit according to the first aspect.
The radiant heat collecting and amplifying circuit receives an infrared radiation signal of a measured object through the collecting circuit, converts the infrared radiation signal into a radiant heat collecting voltage signal and outputs the radiant heat collecting voltage signal, and the primary amplifying circuit is used for amplifying the radiant heat collecting voltage signal and outputting a voltage signal after primary amplification; and after the voltage signal after primary amplification is rectified and filtered by a rectifying and filtering circuit, secondary amplification is carried out by a secondary amplification circuit, and the output voltage signal of the radiant heat collection amplification is output. The radiant heat collecting and amplifying circuit can convert small temperature change into higher voltage output quantity, has high signal collecting precision, low noise and high signal-to-noise ratio, and has higher sampling accuracy and sensitivity.
Drawings
The technical solutions of the embodiments of the present invention are further described in detail with reference to the accompanying drawings and embodiments.
Fig. 1 is a block diagram of a radiant heat collecting and amplifying circuit according to an embodiment of the present invention;
fig. 2 is a specific circuit implementation of the radiant heat collecting and amplifying circuit according to the embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following figures and specific examples, but it should be understood that these examples are for the purpose of illustration only and are not to be construed as in any way limiting the present invention, i.e., as in no way limiting its scope.
The radiant heat collecting and amplifying circuit is applied to the noninvasive glucose meter, is used as a signal collecting circuit of the noninvasive glucose meter, can be used for collecting infrared radiation signals of a tested object and the environment, converting the infrared radiation signals into high voltage output quantity, outputting the high voltage output quantity to a single chip microcomputer of the noninvasive glucose meter, and is used for calculating or outputting sign parameters of the tested object through subsequent processing of a blood glucose test result.
The radiant heat collecting and amplifying circuit of the present invention, the main module structure of which is shown in fig. 1, includes: the device comprises an acquisition circuit 1, a primary amplification circuit 2, a rectification filter circuit 3 and a secondary amplification circuit 4;
the acquisition circuit 1 receives an infrared radiation signal of a measured object, converts the infrared radiation signal into a radiant heat acquisition voltage signal and outputs the radiant heat acquisition voltage signal; the primary amplifying circuit 2 amplifies the radiant heat collecting voltage signal and outputs a primary amplified voltage signal; the voltage signal after the primary amplification is rectified and filtered by the rectifying and filtering circuit 3, and then is secondarily amplified by the secondary amplifying circuit 4, and a radiant heat collection amplification output voltage signal is output.
Fig. 2 shows a specific implementation of the radiant heat collecting and amplifying circuit of the present invention, and the following detailed description is made with reference to fig. 2.
The acquisition circuit 1 includes: a voltage stabilizing filter input circuit formed by a resistor R2 and a capacitor C4 and an acquisition sensor MTP10-B7F 55;
the voltage stabilizing filter input circuit is used for providing reference working voltage for the acquisition sensor; the resistor R2 is a pull-up resistor for clamping the input voltage to a stable voltage value, and the capacitor C4 is used for filtering the input voltage.
A thermistor is arranged in the acquisition sensor MTP10-B7F55 and is connected between pins 2 and 4 of the acquisition sensor MTP10-B7F55, and the resistance value of the thermistor changes along with the change of the environmental temperature, so that the acquisition sensor MTP10-B7F55 can be used for detecting the environmental temperature to obtain environmental temperature data;
the acquisition sensor MTP10-B7F55 detects infrared radiation signals of a detected object under a reference working voltage to generate an infrared response voltage; the infrared response voltage is a physical quantity that changes with a change in temperature of the object to be measured.
The 3-pin of the MTP10-B7F55 of the acquisition sensor is connected with 1.25V bias voltage, and the actually output response voltage is calculated by subtracting the bias voltage from the output of the infrared response voltage after the infrared response voltage is amplified by the internal operational amplifier of the acquisition sensor.
And correcting the response voltage generated by the infrared radiation signal of the detected object according to the environmental temperature data, namely realizing temperature compensation and outputting the radiant heat acquisition voltage signal. The algorithm is solidified inside an acquisition sensor MTP10-B7F55 chip.
The primary amplification circuit 2 includes: an instrumentation amplifier AD8226ARMZ and a gain adjustment resistor R4; the gain adjusting resistor R4 is connected between two gain setting pins (pins 2 and 3) of the instrumentation amplifier AD8226ARMZ, and the amplification factor of the instrumentation amplifier AD8226ARMZ is adjusted by adjusting the resistance value of the gain adjusting resistor R4.
In order to obtain stable working voltage, an 8-pin external filter capacitor C1 of the AD8226ARMZ of the instrument amplifier is connected.
The rectifying-smoothing circuit 3 is composed of a resistor R3 and a capacitor C3.
The second-stage amplifying circuit 4 is connected to the output end of the rectifying and filtering circuit 3, and comprises: the amplifier AD8629ARMZ and a feedback circuit, the feedback circuit is formed by a resistor R37 and a resistor R38.
The non-inverting input end of the amplifier AD8629ARMZ is connected with the output end of the instrumentation amplifier AD8226ARMZ, the output end is connected with the resistor R37 and connected with the inverting input end, and meanwhile, the inverting input end is connected with the bias voltage through the resistor R38.
A decoupling capacitor C9 is connected between the operating voltage terminal of the amplifier AD8629ARMZ and ground to prevent parasitic oscillation caused by the circuit forming a positive feedback path through the power supply.
The invention can amplify the radiant heat collecting voltage signal of the mu V level or the mV level to the radiant heat collecting amplified output voltage signal of the V level.
In a specific implementation, by setting the resistance value of the resistor R4, 100 times amplification of the signal by the instrumentation amplifier AD8226ARMZ is realized, and 10 times amplification is realized by the amplifier AD8629ARMZ, so that the whole radiant heat collecting and amplifying circuit amplifies 1000 times the radiant heat collecting voltage signal output by the collecting sensor. Therefore, the amplification from the infrared radiation signal of the measured object received by the acquisition circuit to the small signal of 1mV-2mV output by the radiant heat acquisition voltage to the stronger signal of 1V-2V can be realized.
The radiant heat collecting and amplifying circuit receives an infrared radiation signal of a measured object through the collecting circuit, converts the infrared radiation signal into a radiant heat collecting voltage signal and outputs the radiant heat collecting voltage signal, and the primary amplifying circuit is used for amplifying the radiant heat collecting voltage signal and outputting a voltage signal after primary amplification; and after the voltage signal after primary amplification is rectified and filtered by a rectifying and filtering circuit, secondary amplification is carried out by a secondary amplification circuit, and the output voltage signal of the radiant heat collection amplification is output. The radiant heat collecting and amplifying circuit can convert small temperature change into higher voltage output quantity, has high signal collecting precision, low noise and high signal-to-noise ratio, and has higher sampling accuracy and sensitivity.
The radiant heat collecting and amplifying circuit is used for a signal collecting circuit of the noninvasive glucose meter and is provided as a signal input source of the single chip microcomputer, so that small signals are amplified to be stronger signals which can be read by the small signal singlechip microcomputer, the signal collecting end of the single chip microcomputer can be protected, and interference of external signals is prevented.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A radiant heat collecting and amplifying circuit, comprising: the device comprises an acquisition circuit, a primary amplification circuit, a rectification filter circuit and a secondary amplification circuit;
the acquisition circuit receives an infrared radiation signal of a measured object, converts the infrared radiation signal into a radiant heat acquisition voltage signal and outputs the radiant heat acquisition voltage signal;
the primary amplifying circuit amplifies the radiant heat collecting voltage signal and outputs a primary amplified voltage signal;
and the voltage signal after primary amplification is rectified and filtered by a rectifying and filtering circuit, and then secondarily amplified by a secondary amplifying circuit, and a radiant heat collection amplification output voltage signal is output.
2. The radiant heat collecting and amplifying circuit according to claim 1, wherein the collecting circuit includes: the voltage stabilizing filter input circuit and the acquisition sensor;
the voltage-stabilizing filter input circuit is used for providing reference working voltage for the acquisition sensor;
the acquisition sensor detects an infrared radiation signal of a detected object under the reference working voltage to generate a response voltage; the response voltage changes along with the temperature change of the measured object;
a thermistor arranged in the acquisition sensor detects the ambient temperature to obtain ambient temperature data;
and correcting the response voltage according to the environment temperature data to obtain the radiant heat collection voltage signal.
3. The radiant heat collecting amplifier circuit of claim 1 wherein the primary amplifier circuit comprises: an instrumentation amplifier and a gain adjustment resistor;
the gain adjusting resistor is connected between two gain setting pins of the instrumentation amplifier, and the amplification factor of the instrumentation amplifier is adjusted by adjusting the resistance value of the gain adjusting resistor.
4. The radiant heat collecting and amplifying circuit according to claim 1, wherein the secondary amplifying circuit comprises: an amplifier and a feedback circuit;
the feedback circuit is connected from the output of the amplifier to the reference signal input of the amplifier.
5. The bolometric collection amplifier circuit of claim 4, wherein the secondary amplifier circuit further comprises a decoupling capacitor having one end connected to the operating voltage input of the amplifier and one end connected to ground.
6. The bolometer-collecting amplifier circuit of claim 1, wherein the bolometer-collecting amplifier circuit amplifies a bolometer-collecting voltage signal of the μ V or mV level to a bolometer-collecting amplified output voltage signal of the V level.
7. Use of a bolometric collection amplifier circuit as defined in any one of claims 1-6 for a signal collection circuit of a noninvasive glucometer.
8. An noninvasive blood glucose meter characterized by comprising the radiant heat collecting and amplifying circuit according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111632141.1A CN114305404A (en) | 2021-12-28 | 2021-12-28 | Radiant heat collecting and amplifying circuit and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111632141.1A CN114305404A (en) | 2021-12-28 | 2021-12-28 | Radiant heat collecting and amplifying circuit and application thereof |
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| CN114305404A true CN114305404A (en) | 2022-04-12 |
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| CN202111632141.1A Pending CN114305404A (en) | 2021-12-28 | 2021-12-28 | Radiant heat collecting and amplifying circuit and application thereof |
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2021
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| CN202840483U (en) * | 2011-11-29 | 2013-03-27 | 上海开通数控有限公司 | Motor temperature anomaly protection circuit for air compressor system |
| CN103654742A (en) * | 2013-12-04 | 2014-03-26 | 江南大学 | Multi-parameter identification system for monitoring human health conditions |
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